(a) For municipal waste landfills in surface mined areas in which the disposal area abuts a highwall, the operator shall design, construct and maintain a barrier between the highwall and the disposal area that meets the following performance standards:
- (1) The barrier shall prevent the lateral migration of leachate from the disposal area.
- (2) The effectiveness of the barrier in preventing the lateral migration of leachate may not be adversely affected by solid waste, solid waste constituents or leachate from the facility.
- (3) The barrier shall meet the requirements of § 273.291(a) (relating to mineral resources).
(b) Unless alternative design requirements to meet the performance standards in subsection (a) are approved as part of the permit under § 271.231 (relating to equivalency review procedure), the barrier shall meet the following design requirements listed in this subsection. The barrier shall be:
- (1) Twelve horizontal feet in thickness.
- (2) No more permeable than 1 x 10-7 cm./sec. based on laboratory and field testing.
- (3) Made of clay as specified in Table I of § 273.256 (relating to primary liner).
- (c) The barrier shall be designed, installed and maintained according to a quality assurance and quality control plan approved by the Department.
- (d) The barrier shall be inspected for uniformity, damage and imperfections during construction and installation.
Cross References
This section cited in 25 Pa. Code § 273.161 (relating to liner system and leachate control plan); and 25 Pa. Code § 273.251 (relating to scope and requirements).